Ever wondered how to fill a region of a picture?

This cool little program demonstrates a basic painting program as well as the hard-to-find dll call for filling a region of a picture. To use the program, all you have to do is draw a line with the left mouse button, then click with the right mouse button to fill the clicked-on area with a random color. Also, as far as I know, this may be the only VB project on the net that has the 'ExtFloodFill' dll call, so make sure to grab it!